We also are using Nebel's
Building Foundations of Scientific Understanding
(BFSU). We just started and are doing our 3rd lesson this week. Catered to K-2, I love going over these important base foundations in science, and look forward to also using his 3-5 book coming out in the spring.
I love this book because it introduces the most basic scientific concepts, and builds up lessons upon these. You'll be learning Nature of Matter, Life Science, Physical Science and Earth & Space Science all in each year, and many lessons correspond closely to a lesson in another "thread".
Here's our first few lessons:
http://satorismiles.com/tag/bfsu/
Satori know says Science is her favorite subject, and I'm also pretty thrilled that I setup a dedicated "Science Corner".
Like a few of the previous posters mentioned, the classical education revisits science topics in a 4-year rotation as they do history, so I am also torn! I have my "classical science curriculum" all picked out if I go the classical route -
R.E.A.L Science Odyssey.
I also have all the Story of Science books by Joy Hakim, also mentioned, but these are for ages 12+, so I will enjoy reading them and then in 6-8 years, my daughter will have them.
I wasn't going to purchase the entire article, but I think I get the gist and I think we'll be doing science as they suggest.